Performance tuning

DSFS performance depends on many factors. DSFS provides performance information to help the administrator determine bottlenecks. The IDFFSPRM file contains many tuning options that can be adjusted. The output of the system MODIFY DSFS,QUERY commands provide feedback about the operation of DSFS. This section describes those IDFFSPRM options and the operator commands that relate to performance.

DSFS performance can be optimized by tailoring the size of its caches to reduce I/O rates and pathlength. It is also important to monitor DASD performance to ensure that there are no volumes or channels that are pushed beyond their capacity.